64-bit Systems Get Optimized Division Algorithm for Performance
Original: Optimization of 32-bit Unsigned Division by Constants on 64-bit Targets
Why This Matters
Compiler optimization advances can significantly improve software performance across applications
Researchers developed new optimization method for 32-bit unsigned division by constants on 64-bit CPUs, achieving 1.67x speedup on Intel Xeon and 1.98x on Apple M4. The LLVM patch has been merged into main branch.
Shigeo Mitsunari and Takashi Hoshino published research optimizing the Granlund-Montgomery method for unsigned integer division by constants, which is used by major compilers like GCC, Clang, and Microsoft Compiler. Their new approach specifically targets 64-bit CPUs for 32-bit division operations, addressing limitations where existing code was designed for 32-bit systems and didn't fully exploit 64-bit capabilities. The researchers implemented patches for LLVM and GCC, demonstrating practical results with 1.67x performance improvement on Intel Xeon w9-3495X (Sapphire Rapids) and 1.98x speedup on Apple M4 processors in microbenchmarks. The LLVM patch has already been integrated into the main branch, indicating industry acceptance of the optimization technique.
Source
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